cottrell



(No Model.)

E. H. GOTTRBLL. N

PRINTING M ACHINE.

No. 534,427. Patented Feb. 19, 13895.

NITED STATES" PATENT Orman.

EDGAR H. COTTRELL, OF STONINGTON, CONNECTICUT, ASSIGNOR TO C. B. COTTRELLdn SONS COMPANY,.OF SAME PLACE.

PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent N o. 534,427, dated February 19, 1895. Application led November 16,1894 Serial No. 528,964.. (No model.)

To @ZZ whom it may concern.:

Be it known that I, EDGAR H. COTTRELL, of Stonington, in the county of New London and State of Connecticut, have invented a new'and useful Improvement in Printing-Machines, of which the following is a specification.

This invention relates to the gearing for driving the impression cylinders of iat bed perfecting printing machines. Its object is to obviate'the back-lash which the lifting of the cylinders renders unavoidable in the arrangement of gearing commonly employed in such machines and also to prevent as far as practical any disturbance of the relation of the gearing between the two cylinders by the lifting of either of them.

I will first describe the improvement in detail with reference to the accompanying drawings and afterward point out its novelty in the claims.

Figure l is a side view of those portions of a at bedperfecting machine .which are necessary to illustrate the improvement. Fig. 2 represents an elevation of the cylinder gearing, a part of the framing and parts inimmediate relation therewith at right angles to Fig.

1. Fig. 3 represents a plan Viewof the gear-A ing.

Similar letters of reference designate corresponding parts in all the figures.

A is the framing of the machine.

B B2 are the impression cylinders, the shafts b b2 of which are' geared together by gears C C2 fast upon them. These gears are like those commonly employed for gearingv such cylinders together except that the gear C on the first impression cylinder has its face wider than the face of the gear C2 on the second impression cylinder, as shown in Figs. 2 and 3, in order that the said gear C may be geared not only with the said gear C2 but also with agear D which is arranged between the said gear C2 and the framing A. The said gear D is fitted to turn loosely on a xed stud a secured in the framing, the axis ofthe said stud being in or approximately inthe same horizontal plane with the axis of the two cyl-v inders so that the said gear occupies a position at one side of the circumference of the gear C and directly between the shafts or journals b b2 of the two cylinders.

E-is the main or driving shaft of the machine arranged in its usual position and carrying a driving gear F which gears with and drives a gear G which I term an intermediate gear arranged to turn freely on a fixed stud o secured tothe framing and gearing with the gear D. The gear F drives the gear G which in turn drives the gear D. This latter gear D gears with the wide-faced gear C on the first impression cylinder B and so drives that cylinder, and the said widefaced gear Cf drives the gear C2 on the second impression cylinder B2 and so the second impression cyllinder is driven fromt-he irst.

The-journal-boxes d ofl both cylinders are represented in Fig. l' as having applied to them the usual lifting rods e, springsf and to'ggles g, the said toggles being operated in the usual way by a cranked rock-shaft h actuated by a cam QJ on a horizontal shaftj, the Vyoke of the said cam being connected with the rock-shafts h by means of rods Z. This mechanism being common needs no further description.

Owing to the position of the gear D with its axis in or approximately in the same horizontal plane with the axis of the gear C or at one side of the circumference of the latter gear, the lifting motion of fthe cylinder does not appreciably disturb the relation between the pitch lines of the said two gears and therefore back-lash is.avoided; and -owing to the said gear D gearing with the said gear C at the same point in the circumference ofthe said gear at which the said gear gears with.

theg ear C2 of the other cylinder. the tendency to the turning of either gear C or C2 and its cylinder by the lifting of the other cylin- ICO 2. In aperfectingprinting machine, the oom- With said driving gear and said loose gear, bination with Jche two impression cylinders, substantially as and for the purpose herein 1o of two gears one fast on one and the other fast set forth. on the other of said cylinders and gearing to- *1 v r 5 gether, a loose gear on a fixed axis arranged EDGAR H' C0 El BELL' between the journals of said cylinders and Witnesses: gearing with one of said fast gears,a driving FREDK. HAYNES,

gear, and an intermediate gear gearing only GEORGE BARRY. 

